Tread portion of an automobile tire



FIG. 1 is a front view of a tread portion of an automobile tire;

FIG. 2 is a perspective view thereof;

FIG. 3 is a left side view thereof; and,

FIG. 4 is a fragmentary enlarged view showing the details of the treadportion thereof.

The broken lines defining the sidewall and inner bead of the tire depictenvironmental subject matter that forms no part of the claimed design.

The ornamental design for a tread portion of an automobile tire, asshown and described.